buck·wheat /ˈbʌkˌhwit, ˌwit/
  喬麥,喬麥之種,喬麥粉
  Buck·wheat n.
  1. Bot. A plant (Fagopyrum esculentum) of the Polygonum family, the seed of which is used for food.
  2. The triangular seed used, when ground, for griddle cakes, etc.
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  buckwheat
       n 1: or member of genus Fagopyrum; annual Asian plant with
            clusters of small pinkish white flowers and small edible
            triangular seeds which are used whole or ground into
            flour [syn: Polygonum fagopyrum, Fagopyrum esculentum]
       2: grain ground into flour